SHORT-CIRCUIT PROTECTION: Equipped w/ built-in electronic overload and short circuit protection to ensure the safety of the operator and any connected electronics. Has rugged and durable housing construction safe for benchtop or desktop placement CONVERTS AC TO DC: Features AC to DC power supply variable linear/regulated design. Provides convenient and reliable AC-to-DC power conversion w/ constant source of DC voltage. Works w/ cellular phones, CB radio, scanner, HAM radio, etc PLUG-IN OPERATION: The simple plug-in operation provides a constant source of DC voltage, allowing for quick and consistent power conversion. Switch-activated power control eliminates the need for an external battery or additional power source USB AND SCREW-TYPE TERMINALS: This workbench linear variable power supply features USB charge port and universal screw connection terminals compatible w/ a wide range of device/equipment. Used to test device/equipment operation and performance BUILT-IN COOLING FAN